(unnamed)

(unnamed) is 490 m long, and has a stream level of 3.

Map of (unnamed)

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(unnamed) flows into 巌頭洞川 , which it joins at N 35° 21′ 24″, E 137° 1′ 26″ at OSM node n727089019, and there 3 km of total upstream flows in.

(unnamed) has 2 tributaries.

巌頭洞第4支流, which joins it at N 35° 21′ 35″, E 137° 1′ 37″ at OSM node n727027157, and 1 km of total upstream flows in.

巌頭洞第３支流, which joins it at N 35° 21′ 35″, E 137° 1′ 37″ at OSM node n727027157, and 718 m of total upstream flows in.